
Serving Greenfield, WI and surrounding areas
Approved
In business since 1877
Free estimates
Emergency services offered
"Great job on both furnace & air condit"


Serving Greenfield, WI and surrounding areas
Approved
In business since 1877
Free estimates
Emergency services offered
"Great job on both furnace & air condit"

Serving Greenfield, WI and surrounding areas
Approved
In business since 1987
Free estimates
Emergency services offered
"Always great work, very thorough for our summer tuneup to get the air conditioning season started"





+8

Serving Greenfield, WI and surrounding areas
Approved
In business since 2008
Free estimates
Emergency services offered
"Furnace in my home stopped working. Went through Home Advisor and had one company come over. They had stated that I needed a new furnace.Scott had called and came over within 1 hour, checked my furnace and found that it was plugged. He did the repairs and running great again. This is the second time he had done work for me a year ago on my air conditioning unit.He does great work, honest and his prices are fair. I will not rely on anyone else, except for Scott. He is my permanent repair man."





Serving Greenfield, WI and surrounding areas
Approved
In business since 2000
Free estimates
Credit card accepted
"Mamayek Heating was very proficient with their installation of whole house central air-conditioning in our 1896 year-old home which never had a unit in place. From start to finish, they accommodated our needs and schedule as well as leaving behind a nicely done project in working order. Thank you to the 3 Bobs for all their help!"
Serving Greenfield, WI and surrounding areas
Approved
In business since 1997
Free estimates
Emergency services offered
"The install took longer than expected because they are a small company, and were extra busy with other jobs that week. However, when it was all said and done, I am quite pleased with the results. The AC works great in the summer, and my winter heating bills are almost 50% less than they used to be. Would I do it again? Yes. Would I wait this long to do it? No Way! One of the main reasons Bob's company is special is that he does a good portion of the work himself. It's not contracted out to people you don't know. You meet Bob, and he does the work. Bob was also very accommodating about where to place vents, how to route ducts, etc... He also did a good job at educating me on how the system works along the way. Thanks Bob!"

Serving Greenfield, WI and surrounding areas
Approved
Super Service Award Winner
In business since 2002
Free estimates
Emergency services offered
"My technician Kyle was very informative and respectful. He explained what was going on and was very professional. Kyle even left me with an electric heater for the evening until they could replace my furnace the next day. Kyle was back early the next morning to start the replacement of my old furnace for the new one and it is working great! I am so happy that I was able to get this done right away."





Serving Greenfield, WI and surrounding areas
Approved
In business since 2024
Free estimates
Emergency services offered
"Shane was able to schedule a prompt appointment. He arrived on time and performed a thorough diagnostic on the furnace. He identified an issue I was unaware of and corrected the problem with the air conditioner using parts that were still under warranty. I will gladly use his services again."





+2

Serving Greenfield, WI and surrounding areas
Approved
Super Service Award Winner
In business since 1990
Free estimates
Emergency services offered
"Customer service was excellent. Everyone from the person who first answered the phone to the guys who did the cleaning were friendly, professional, courteous, and thorough. We can tell the difference in the air quality already and our furnace sounds quieter too."

Serving Greenfield, WI and surrounding areas
Approved
In business since 2022
Free estimates
Emergency services offered
"Marti, was very helpful. Respond quickly and came by within a few hours. I had two other companies come by and wanted a much more than Fast air. I highly recommend these guys."

Serving Greenfield, WI and surrounding areas
Approved
In business since 2025
Free estimates
Credit card accepted
Were dedicated to providing our clients with the very best in installation, service, and repair for your heating and cooling needs. Our company is built on honesty and integrity. We specialize in central A/C and cooling systems as well as heating and furnace systems. We take pride in the quality of our work and our commitment to outstanding results. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.





+37
Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.
Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.
Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.
Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.
Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.
From average costs to expert advice, get all the answers you need to get your job done.

Use this guide to budget for appliance installation costs based on factors such as appliance type, installation complexity, labor rates, and more.

Explore how factors such as materials, local labor rates, and the type of damage affect the cost to repair a burst pipe.

Use this guide to learn how much rebar costs per foot so you can budget for your next big home improvement project.

Discover how factors such as linear footage, local labor rates, and trim type affect the total cost of painting baseboards.

Learn how much cat or dog door installation costs based on factors like the door size, material, location, and added features.

Discover how much an electric furnace costs based on factors such as unit size, local labor rates, electrical upgrades, and ductwork condition.